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(No Model.)

H. e. RAMSP ERGER. PHOTOGRAPHIU 0R LABORATORY LAMP.

No. 427,187. Patented May 6. 1890.

I O a mu h III I N V EN TO B Havmam QIRMWQQTQCY- CZM M ATTORNEY- ATENT Fries.

HERMANN G. RAMSPERGER, OF NEW YORK, N. Y.

PHOTOGRAPHIC OR LABORATORY LAMP.

SPECIFICATION forming part of Letters Patent No. 427,187, dated May 6, 1890.

Application filed March 5, 1889. Serial No. 301,843. (No model.)

To all whom it may concern-.-

Be it known that I, HERMANN G. RAMSPER- GER, a citizen of the United States, and a resident of New York, in the county and State of New York, have invented a new and useful Improvement in Photographic or Laboratory Lamps, of which the following is a specification.

My invention relates to a new lamp which is especially intended for use in photographic laboratories or in photographic dark-chambers for the purpose of illumination, but which can be used also in physical laboratories, in

' lamp provided with my improvement.

spectrum analysis, and the like.

- Hy invention consists, essentially, in combining with a lamp, preferably a Bunsenburner or an alcohol lamp giving a colorless flame, a wick embodying a chemical and arranged to enter the flame from below. For photographic purposes I make use of a wick saturated with a solution of chloride of sodium (common salt) or other material, which, when acted upon by the flame, produces a non-actinic light. In the physical laboratory the wick will of course embody the material to be analyzed. Heretofore it has been the custom to suspend the substance intended to color the flame directly in the latter by means of a platinum wire; but this method is especially objectionable in the photographic laboratory or dark-chamber on account of the rapid consumption of the substance and the consequent frequent renewal necessary.

In the accompanying drawings, Figure 1 represents an elevation of a Bunsen burner provided with my improvement. Fig. 2 is a vertical central section of the same. Fig. 3 shows a modification. Fig. 4 is a perspective of a Wick. Fig. 5 shows the burner as constructed to fit on a gas-fixture. Fig. 6 is an elevation of the coupling shown in Fig. 5. Fig. 7 is a sectional elevation of an alcohol- Fig. Sis an elevation of a modified form of the wick. Fig. 9 is a sectional elevation showing the wick, illustratedin Fig. 8 as appliedto an alcohol-lamp.

Similar letters indicate corresponding parts.

In the drawings, referring at present to Figs. 1, 2, and 4, the letter A designates a Bunsen burner of a usual construction. B is a sleeve, or, as I shall hereinafter term it,

justed to project above the top of the same so as to'bring the exposed portion into contact with the flame or jet. The wick may be secured to the burner by any suitable means. In Figs. 1 and 2 I have shown it secured by means of a thumb-screw a in the tubular body of the carrier 0, which carrier at the same time is held to the burner by said screw and serves to support the chimney D.

In Fig. 3 the carrier 0 is provided with an internal screw-thread, which engages with a screw-thread on the burner. of the wick abuts upon the carrier, and it can therefore be adjusted by turning the carrier. When the wick has been properly adjusted, it will for a long period of time supply the chemical with which it is saturated, and when the exposed portion is burned out the wick can be trimmed and readjusted.

For photographic purposes I prefer to make the wick of asbestus paper or bibulous pa per, as these materials can be easily trimmed and readily absorb the solution. However, it could be made of other material and covered with a coat of the salt. This sleeve is then placed in an aqueous solution of common salt and allowed to become thoroughly impregnated. It is then removed and dried, whereupon it is ready for use. Of course any other chemical or substance which will give a non-actinic flame can be used in place .of the common salt-such, for instance, as nitrate of strontium. The chimney D for filtering the light is also best made of a non-actinic colored glass.

In Fig. 6 I have shown a burner which can be applied to an ordinary gas-fixture. To this end I make use of a coupling E, having a tip I) in its upper end, which corresponds in character and position to the usual tip found in the Bunsen burner. (See Fig. 2.)

This coupling is adapted to fit over gas-burners of the usual form. This form of Bunsen burner is very convenient when the laboratory is already provided with gas-fixtures.

It is evident that my device can be equally as well applied to alcohol lamps or other lamps constructed to give a colorless flame.

The lower end In Fig. 7 I have shown an alcohol-lamp F, provided with a tubular wick of the character described.

In Fig. 8 I have shown the wick provided with slots or openings 0 in its periphery. This is intended for use on lamps having short wick-tubes Fig. 9, the openings in this case permitting a free access of air to the flame.

I do not wish to restrict myself to any particular form for the wick or to any of the described means for securing the same, as it is evident that both the form of the wick and the means for securing the same can be varied without departing from the invention herein described.

Alamp constructed according to my invention can be substituted for the ordinary ruby dark-chamber lamp, with the advantage that it gives a better illumination without a corresponding increase in the effect on the sensitive plates or on the chemicals when preparing the same for the plate.

It is evident that the wick can be made either of a refractory material, such as asbestus, or a combustible material, such as bibulous paper. In the latter case the paper rapidly burns out, the residue remaining impregnated with the chemical.

Again, I do not wish to restrict myself to asbestus, paper, &c., as a base for the substance to be burned, since it is evident that a wick could be formed or built up by pressing or molding the chemical by itself or in combination with a binding material. However, the use of a base such as paper or asbestus' is preferable, in so far as it renders the wick less liable to breakage.

What I claim as new, and desire to secure by Letters Patent, is-

1. In a photographic or laboratory lamp, the combination of a burner for providing a flame and a wick embodying a chemical and arranged to enter the flame from below, substantially as and for the purpose set forth.

2. In a photographic or laboratory lamp, the combination of a burner for providing a flame and a tubular wick embodying a chemical 4.. In a photographic lamp, a tubular wick surrounding the burner and containing a chemical and a chimney-carrier engaging a thread on the burner and engaging with the wick for adjusting the same, substantially as described.

5. As a new article of manufacture, a wick for photographic lamps containing chloride of sodium or its equivalent, all in a dry state, substantially as described.

6. As a new article of manufacture, a tubular wick for photographic lamps and the like, having the peripheral openings and saturated with a chemicalsuch as chloride 'of sodium or its equiva1entfor producing a non-actinic light, substantially as described.

7. In a photographic lamp, a tubular wick surrounding the burner and coated or impregnated with chloride of sodium or its equivalent for producing a non-actinic light, said wick being arranged to enter the flame from below, and means for adjusting the wick, substantially as described.

8. In a photographic lamp, a wick consisting of a sleeve containing chloride of sodium or its equivalent, which sleeve encompasses the burner or wick-tube and is arranged to project above the end of the same to come into contact with the flame from below, substantially as described.

In testimony that I claim the foregoing as my invention I have signed my name, in presence of two witnesses, this 27th day of February, 1889.

I-IERMANN e. RAMSPERGER.

Witnesses:

A. FABER DU FAUR, Jr., EDWIN F. STERN. 

